Sort array elements by frequency in ascending order - Java Quiz Question

Write a program to sort given array according to frequency of occurrence of numbers, in ascending order.

Input (int[])	Output (int[])
{1, 4, 3, 4, 5, 4, 5}	{1, 3, 5, 5, 4, 4, 4}
{9, 3, 9, 2, 3, 2, 1, 2, 2, 3}	{1, 9, 9, 3, 3, 3, 2, 2, 2, 2}
{4, -1, 0, 4, -1, 0, -1}	{4, 4, 0, 0, -1, -1, -1}
{6, 4, 6, 1, 6, 1}	{4, 1, 1, 6, 6, 6}

	
		class SortByOccurrenceInAscendingOrder	
			{    public static void main(String s[])
    {
        int array[] = {3, 4, 5, 0, 0, 0, 0, 0, 3, 3, 3, 5, 1, 5};
        sortByOccurrence(array);
        for (int n : array)
        System.out.print(n + " ");

    }
 
			

				public static void sortByOccurrence(int[] inputArray) { 

				//Write code here to sort array according to occurrence of numbers in ascending order 

				} 

				 

				//If required, write any additional methods here 

			}

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